Direct-Drive Turntable (1977-1981)
mkI Servo control, mkII Quartz locked
The SL-1800 features full Technics uncompromising direct drive performance in a simple, straightforward package.
The centre of this sleek, attractive unit is its highly accurate One Chip IC controlled servo drive motor.
This direct drive motor, which incorporates all of the design features of all Technics fine DD motors, is controlled by the unique BFG system which utilises the back electromotive force induced by the rotor in the stator field coils to monitor the platter speed.
The frequency generator in the SL-1800 uses the waveform obtained as its reference and it is compared with the standard calibration frequency from the reference oscillator.
In this way, a signal to correct the speed can be sent instantly whenever needed to change the motor drive current in order to maintain precise platter speed.
Type: manual turntable
Drive method: direct drive
Control method: servo control (mk1), quartz synthesizer (mk2)
Motor: DC motor
Platter: 330mm (mk1), 332mm 2kg (mk2) aluminium alloy die-cast
Speeds: 33 and 45rpm
Pitch control: 10% (mk1), 12% (mk2)
Wow and flutter: 0.025% WRMS
Rumble: -73dB (mk1), -78dB (mk2)
Tonearm: universal static balance type
Effective length: 230mm
Effective mass: 12g (mk2)
Dimensions: 125 x 453 x 369mm (mk1), 149 x 453 x 399mm (mk2)
Weight: 8.5kg (mk1), 9.8kg (mk2)
mkII instruction/owners manual - tmsears
1978 advert - j_loop
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Technics SL-1800 / SL1800 owners manual, service manuals and schematics are for reference only and the Vinyl Engine bears no responsibility for errors or other inaccuracies. The PDF files are provided under strict licence. Reproduction without prior permission or for financial gain is strictly prohibited. This website is not affiliated with or sponsored by Technics.